How Many Square Feet Is 30x40?
An area of 30x40 feet is 1,200 square feet (30 × 40). That is 133.3 square yards, 111.5 square meters or 0.028 acres, about 43% of a tennis court (78 x 36 ft).
30x40 feet in other units
| Measure | Value |
|---|---|
| Square feet | 1,200 sq ft |
| Square yards | 133.3 sq yd |
| Square meters | 111.5 sq m |
| Acres | 0.028 acres |
| Perimeter | 140 ft |
| Diagonal (corner to corner) | 50 ft |
Square feet = length × width = 30 × 40 = 1,200. Square yards = sq ft ÷ 9, square meters = sq ft × 0.0929, acres = sq ft ÷ 43,560. About 36 areas of 30x40 ft fit in one acre.
Materials for 1,200 square feet
| Project | Amount |
|---|---|
| Flooring or tile, with 10% extra for cuts | 1,320 sq ft |
| Mulch, 3 inches deep | 11.11 cu yd |
| Gravel, 4 inches deep | 14.81 cu yd (about 20.74 tons) |
| Concrete slab, 4 inches thick | 14.81 cu yd |
Volumes are before any extra for settling or spillage. Use the tile calculator, gravel calculator or concrete calculator for the exact order, with extra and cost.
Not a perfect rectangle?
Measure an L-shaped room, a triangular corner or a lot with a diagonal side with the square footage calculator. It works in feet, inches, yards or meters, and subtracts closets, stairs or any area you do not want to count. For painting, the wall area matters more than the floor: see the paint calculator.
Frequently asked questions
How many square feet is a 30x40 room?
A 30x40 ft room is 1,200 square feet. Multiply the length by the width: 30 × 40 = 1,200 sq ft.
How many square yards is 30x40 feet?
1,200 square feet is 133.3 square yards. A square yard is 3 ft × 3 ft = 9 square feet, so divide the square feet by 9.
How many square meters is 30x40 feet?
1,200 square feet is 111.5 square meters. Multiply the square feet by 0.0929 (1 ft = 0.3048 m, so 1 sq ft = 0.09290304 sq m).
How many acres is 30x40 feet?
1,200 square feet is 0.028 acres. An acre is 43,560 square feet, so about 36 areas of 30x40 ft fit in one acre.
How do I find the square footage of an L-shaped or irregular space?
Split the space into rectangles, multiply length by width for each one and add the results. The square footage calculator does this for L-shapes, triangles, circles and lots with a diagonal, and subtracts areas you do not need.
Other sizes
Figures are for a rectangle measured in feet. Real rooms have walls with thickness and lots have boundaries, so measure the actual space.